Drill socket or chuck.



, PATENTBD SEPT. 3, 1907.

0. G. ROBERTS. DRILL SOCKET 0Rl CHUCK.

APPLICATION FILED DBO. 29, 1904.

UNITED STATES PATENT OFFICE.

CHARLES C. ROBERTS, OF ANSONIA, CONNECTICUT.

'DRILL SOCKET OR CHUCK.

` Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed December 29, 1904. Serial No. 238,827.

ciiically described for securing a bit to the socket orl chuck whether the tang of the bit be uninjured or whether the tang is torn off in part or whole.

The invention further aims to provide a drill socket or chuck with means for securing a bit thereto, said means being simple in its construction, strong, durable, eicient in its use and comparatively inexpensive to set up.

With the foregoing and other objects in view the invention consists of the novel construction, combination and arrangement of parts hereinafter more specifically described, illustrated in the accompanying drawings which form a part of this specification and wherein is shown a preferred embodiment of the invention, but it is to be understood that changes, variations and modiiications can be resorted to which come within the scope of the claims hereunto appended.

In the drawings where like reference characters denote corresponding parts through the several views, Figure l is a vertical sectional view of a drill socket provided with means constructed in accordance with this invention for securing a bit in position, said means also being in section. Fig. 2 is a sectional plan of a drill socket and a bit-securing means constructed in accordance with this invention. Fig. 3 is a detail of the securing band, and Fig. l is a detail of one of the clamping elements.

Referring to the drawings by reference characters, 1 denotes the drill holder or chuck provided at one end with exterior screw-threads 2, and further provided in the screw-threaded end with a recess 3 which forms a socket to receive the shank 4 of the bit 5. The socket end of the holder is cut away, as at 6, 7, so as to form openings 8, 9, to permit of the shank projecting into the recesses 6, 7. Those portions of the shank which project into the recesses 6, 7 are grooved, as at l0. Upon the screw-threaded end of the drill-holder or chuck the means for securing the bitin position is carried, and saidlmeans will now be described.

The reference character 1l. denotes an adjustable collar, having its lower end provided with an inwardlyextending iiange 12, the edge of said flange being screw-threaded and adapted to engage in the screwthreads at the socket-end of the drill-holder; by such a construction, the collar 11 can be adjusted to various positions upon the socketeend of the drill-holder. Seated within the collar 11 and resting upon the upper face of the iiange 12 is an adjustable securing band 13, having its inner face at diametrically opposite points cut away, as at 14, to form recesses, with one wall thereof inclined. The recesses 111, when the band 13 is in operative position, are adapted to be arranged .opposite the recesses 6, 7. Mounted within each of the recesses 14 is a clamping wedge l5, which is of the same length as its respective recess 14, but not as wideand has one face thereof plane and its other face convex. The convexed faces of the wedges 15 are adapted to engage in the grooves formed in the shank 4so as to bind or clamp the shank in position and the manner in which this is done will be hereinafter referred to. Secured to the top of the collar 1 1 and surrounding the socket-end of the drill-holder is a flat ring 1G which is adapted to retain the band 13 within the collar l1 and the wedges 15 within the band 13.

The manner in which the device is operated is as follows: The collar 11, band 13 and wedges l5 being in position on the socket-end of the drill-holder, the shank of the bit is inserted in the socket and the collar 1l. adjusted so as to move away from the screw-threaded end of the socket, which carries the band 13 therewith, at the same time moving-the wedges to clamping position, the band 13 retaining the wedges 15 in position; by such an arrangement the shank is securely clamped within the socket, as well as forced therein owing to the size of the clamping members Ywith respect to the size of the recesses.

The invention is particularly applicable to drilling machine spindles to hold up the drill-socket or boring bars which are used for facing up holes. The common practice now in vogue is to employ a set-screw in the spindle which is very dangerous as the operator is apt to get his garments caught on it. It also spoils the sockets and bars as holes are drilled in them to let the set-screw enter so they will be retained in position.

Having thus described the invention, what I claim as new and desire to obtain by Letters-Patent, is:

A drill socket comprising the combination with a socket member' provided with a pair of openings and recesses and further provided with an exterior screw thread at the lower end thereof, of a collar surrounding said socket and having an inwardlyextending screw-threaded flange engaging the screw threads of said member, said collar adjustable in the direction of the length of the socket, a securing band surrounding the socket member,

mounted upon and supported by the iiange of the collar and provided with a pair of recesses opposing the openings in the socket member, each of said recesses having an upwardly and outwardly inclined wall, a pair of wedge members of less width than the recesses in the socket member, each of said wedge members having a rounded portion and a downwardly and inwardly-inclined portion, each of said wedge members mounted in a recess in Said band and adapted to have the rounded portion thereof extend through a recess in the socket member and directly engage a bit projecting through an opening in the socket member and each of said wedge members having the inclined por tion thereof cooperating with the inclined Wall of the recess so that when said collar is adjusted in one direction the bit will be clamped in position and moved into the socket, and means mounted upon and connected to the 10 collar for retaining the band and the wedge members therein.

In testimony whereo I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES C. ROBERTS,

Witnesses:

F. H. LEE, MILTON C. ISBEL. 

